MAX6882ETE+ Maxim Integrated Products, MAX6882ETE+ Datasheet

IC SEQUENCE/SUPERVISOR 16TQFN

MAX6882ETE+

Manufacturer Part Number
MAX6882ETE+
Description
IC SEQUENCE/SUPERVISOR 16TQFN
Manufacturer
Maxim Integrated Products
Type
Sequencerr
Datasheet
1.MAX6880ETG.pdf (19 pages)

Specifications of MAX6882ETE+

Number Of Voltages Monitored
2
Output
Open Drain or Open Collector
Reset
Active Low
Reset Timeout
Adjustable/Selectable
Voltage - Threshold
Adjustable/Selectable
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-TQFN Exposed Pad
Monitored Voltage
- 0.3 V to + 6 V
Manual Reset
Resettable
Watchdog
No Watchdog
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.7 V
Supply Current (typ)
1100 uA
Maximum Power Dissipation
1349 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX6880–MAX6883 dual-/triple-voltage monitors
are designed to sequence power supplies during
power-up condition. When all of the voltages exceed
their respective thresholds, these devices turn on volt-
ages to the system sequentially, enhancing n-channel
MOSFETs used as switches. The time between each
sequenced voltage is determined by an external
capacitor, thus allowing flexibility in delay timing. The
MAX6880/MAX6881 sequence three voltages and the
MAX6882/MAX6883 sequence two voltages.
These devices initially monitor all of the voltages and
when all of them are within their tolerances, the inter-
nal charge pumps enhance external n-channel
MOSFETs in a sequential manner to apply the volt-
ages to the system. Internal charge pumps drive the
gate voltages 5V above the respective input voltage
thereby ensuring the MOSFETs are fully enhanced to
reduce the on-resistance.
The MAX6880–MAX6883 feature capacitor-adjustable
slew-rate control to provide controlled turn-on charac-
teristics. After all of the voltages reach 92.5% of their
final value, a power-good output (MAX6880/MAX6882)
signal is active. The power-good output (PG/RST) can
be delayed with an external capacitor to create a
power-on reset delay. After the initial power-up phase,
the MAX6880–MAX6883 continue to monitor the volt-
ages. If any of the voltages falls below its threshold, the
MOSFETs are quickly turned off and the voltages are
tracked down together. An internal 100Ω pulldown
resistor ensures that the capacitance at the MOSFET’s
source is discharged quickly. The power-good output
goes low to provide a system reset.
The MAX6880–MAX6883 are available in small 4mm x
4mm 24-pin and 16-pin thin QFN packages and speci-
fied over the -40°C to +85°C extended operating tem-
perature range.
19-3772; Rev 1; 10/05
Selector Guide appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Multivoltage Systems
Networking Systems
Telecom
Storage Equipment
Servers/Workstations
________________________________________________________________ Maxim Integrated Products
General Description
Dual-/Triple-Voltage, Power-Supply
Applications
Sequencers/Supervisors
♦ Capacitor-Adjustable Power-Up Sequencing
♦ Internal Charge Pumps to Enhance External
♦ Capacitor-Adjustable Timeout Period Power-Good
♦ Adjustable Undervoltage Lockout or
♦ Internal 100Ω Pulldown for Each Output to
♦ 0.5V to 5.5V Nominal IN_/OUT_ Range
♦ 2.7V to 5.5V Operating Voltage Range
♦ Immune to Short Voltage Transients
♦ Small 4mm x 4mm 24-Pin or 16-Pin Thin QFN
+Denotes lead-free package.
MAX6880ETG+
MAX6881ETE+
MAX6882ETE+
MAX6883ETE+
Pin Configurations continued at end of data sheet.
Delay
n-Channel FETs
Output (MAX6880/MAX6882)
Logic-Enable Input
Discharge Capacitive Load Quickly
Packages
TOP VIEW
*EXPOSED PADDLE CONNECTED TO GND.
PART
GATE2
GATE1
OUT1
IN3
IN2
IN1
19
20
21
22
23
24
18
1
4mm x 4mm THIN QFN
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
+
17
2
Ordering Information
MAX6880
16
3
Pin Configurations
EP*
15
4
14
5
24 Thin QFN
16 Thin QFN
16 Thin QFN
16 Thin QFN
PIN-
PACKAGE
13
6
12
11
10
9
8
7
Features
N.C.
N.C.
TIMEOUT
SLEW
DELAY
GND
T2444-4
T1644-4
T1644-4
T1644-4
CODE
PKG
1

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MAX6882ETE+ Summary of contents

Page 1

... Nominal IN_/OUT_ Range ♦ 2.7V to 5.5V Operating Voltage Range ♦ Immune to Short Voltage Transients ♦ Small 4mm x 4mm 24-Pin or 16-Pin Thin QFN Packages PART MAX6880ETG+ MAX6881ETE+ MAX6882ETE+ MAX6883ETE+ +Denotes lead-free package. TOP VIEW GATE2 Applications GATE1 *EXPOSED PADDLE CONNECTED TO GND. ...

Page 2

Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) IN1, IN2, IN3.............................................................-0.3V to +6V ABP .........................................-0.3V to the highest of V SET1, SET2, SET3 ....................................................-0.3V to +6V GATE1, GATE2, GATE3 .........................................-0.3V to +12V OUT1, OUT2, ...

Page 3

Dual-/Triple-Voltage, Power-Supply ELECTRICAL CHARACTERISTICS (continued) (IN1, IN2, or IN3 = +2.7V to +5.5V, EN/UV = MARGIN = ABP +25°C, unless otherwise noted.) (Note 1) A Power-Good Threshold Power-Good Threshold Hysteresis GATE_ Output High GATE_ Pullup Current ...

Page 4

Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors 125mV DOWN = STOP RAMP THRESHOLD REFERENCE RAMP POWER-UP Figure 1. Stop Ramp/Fault Window During Power-Up and Power-Down EN/UV V EN_R IN1 = 3.3V IN2 = 1.8V IN3 = 0.7V IN_ CAPACITOR- ADJUSTED SLEW RATE OUT_ t ...

Page 5

Dual-/Triple-Voltage, Power-Supply EN/UV V EN_R IN1 = 3.3V IN2 = 1.8V IN3 = 0.7V IN_ CAPACITOR- ADJUSTED SLEW RATE OUT_ t DELAY PG/RST FORCED INTO QUICK SHUTDOWN WHEN OUT1 FALLS BELOW 92.5% of IN1 Figure 3. Sequencing In Fast Shutdown ...

Page 6

Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors EN/UV BUS VOLTAGE MONITORED THROUGH EN/UV INPUT V EN_R IN1 = 3.3V IN2 = 1.8V IN3 = 0.7V IN_ CAPACITOR- ADJUSTED SLEW RATE OUT_ t DELAY PG/RST = LOW Figure 4. Timing Diagram (Aborted Sequencing) EN/UV V ...

Page 7

Dual-/Triple-Voltage, Power-Supply = 200pF MARGIN = ABP 2.7V to 5.5V, C IN_ SLEW V SUPPLY CURRENT CC vs. INPUT VOLTAGE 1.4 1 +85°C A 1.2 1 +25° ...

Page 8

Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors = 200pF MARGIN = ABP 2.7V to 5.5V, C IN_ SLEW GATE_ VOLTAGE LOW vs. SINK CURRENT 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0 ...

Page 9

Dual-/Triple-Voltage, Power-Supply PIN MAX6880 MAX6881 MAX6882 1, 11, — — 12 — — — ...

Page 10

Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors PIN MAX6880 MAX6881 MAX6882 14 — — — — ...

Page 11

Dual-/Triple-Voltage, Power-Supply IN1 MAX6880 SET1 IN2 COMP SET2 IN3 COMP SET3 VBUS COMP EN/UV COMP V MARGIN GND ______________________________________________________________________________________ Sequencers/Supervisors IN2 IN3 IN1 ABP INTERNAL V /UVLO CC RAMP GENERATOR CONTROL LOGIC SEQUENCING MONITOR REF DELAY SLEW C SLEW Functional ...

Page 12

Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors Detailed Description The MAX6880–MAX6883 multivoltage sequencers/supervisors monitor three (MAX6880/ MAX6881) and two (MAX6882/MAX6883) system volt- ages and provide proper power-up and power-down control for systems requiring voltage sequencing. These devices ensure the controlled voltages sequence in the ...

Page 13

Dual-/Triple-Voltage, Power-Supply reference ramp voltage. During ramp down OUT_ voltage is greater than the reference ramp voltage by more than V , the control loop dynamically stops the TRK control ramp voltage from decreasing until the slow OUT_ ...

Page 14

Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors Table 1. C Timing Formulas SLEW TIME PERIOD Slew Rate (9. 3.506 x 10 RETRY t 2.191 x 10 FAULT Limiting Inrush Current The capacitor ( SLEW to ground, controls the SLEW ...

Page 15

Dual-/Triple-Voltage, Power-Supply Applications Information MOSFET Selection The external pass MOSFET is connected in series with the sequenced power-supply source. Since the load current and the MOSFET drain-to-source impedance (R ) determine the voltage drop, the on characteris- DS tics of ...

Page 16

Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors IN1 IN2 IN3 V BUS 16 ______________________________________________________________________________________ Typical Application Circuit 0.1µF 0.1µF 0.1µF IN1 IN2 IN3 GATE1 GATE2 SET1 SET2 MAX6880 SET3 EN/UV ABP SLEW GND DELAY TIMEOUT 1µF OUT1 OUT2 OUT3 GATE3 OUT1 OUT2 OUT3 PG/RST ...

Page 17

Dual-/Triple-Voltage, Power-Supply TOP VIEW OUT1 13 GATE1 14 MAX6881 IN3 15 EP* IN2 4mm x 4mm THIN QFN *EXPOSED PADDLE CONNECTED TO GND. ______________________________________________________________________________________ Sequencers/Supervisors Pin Configurations (continued) SLEW 8 ...

Page 18

Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 18 ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm ...

Page 19

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © 2005 Maxim Integrated Products ...

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